Analog Devices Inc. AD4682BCPZ-RL7

Overview

AD4682BCPZ-RL7 from Analog Devices is a dual, simultaneous-sampling, 16-bit pseudo-differential SAR ADC with 1 MSPS throughput, 87.5 dB SNR (VREF = 3.3 V), ±2.5 LSB INL max, and integrated 2.5 V reference - designed for high-precision motor current/position feedback and power quality monitoring in industrial control systems.

For engineers reviewing the AD4682BCPZ-RL7 datasheet, AD4682BCPZ-RL7 pinout, AD4682BCPZ-RL7 application, or AD4682BCPZ-RL7 equivalent, this page delivers verified specs, real-world timing behavior, validated dual-channel isolation performance, oversampling configuration impact on dynamic range, and confirmed pin-compatible alternatives for layout-constrained designs.

Technical Context

The AD4682BCPZ-RL7 implements two independent SAR cores sharing a single serial interface with dual SDO outputs (SDOA/SDOB), enabling true simultaneous sampling of two pseudo-differential inputs (AINA±, AINB±) on the falling edge of CS. Its internal 2.5 V buffered reference supports external use via REFIO, while configurable oversampling (OSR up to ×8) and resolution boost (to 18-bit effective) are implemented in dedicated on-chip hardware blocks.

Conversion is controlled by standard SPI-compatible signals (CS, SCLK, SDI) with 1.65–3.6 V logic compatibility, and features alert generation via SDOB/ALERT when conversion results exceed programmable thresholds - all operating across −40°C to +125°C with 3 mm × 3 mm LFCSP packaging and exposed pad thermal management.

Key Specifications

Pinout & Package

AD4682BCPZ-RL7 is housed in a 3 mm × 3 mm, 16-lead LFCSP package with exposed pad (EPAD) that must be soldered to PCB ground for thermal and electrical integrity. Pin 1 and Pin 10 are GND reference points; Pin 16 is SCLK; Pin 12 is active-low CS; Pins 13 and 14 serve as SDOA and SDOB/ALERT respectively.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual simultaneous-sampling ADC applications.

Compared with AD4683BCPZ-RL7, the AD4682BCPZ-RL7 delivers 2× higher throughput and 1.5× higher dynamic range at full speed, while AD7380BCPZ-RL7 trades integrated reference and pseudo-differential simplicity for raw speed and differential noise immunity - making AD4682BCPZ-RL7 optimal for industrial motor control where timing determinism, dual-channel correlation, and self-contained reference are prioritized.

Availability

AD4682BCPZ-RL7 is available at Aetrix Electronics and suitable for motor control position feedback, power quality monitoring, and EDFA bias control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD4682BCPZ-RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD4682BCPZ-RL7 belongs to Analog Devices' precision SAR ADC portfolio, engineered specifically for deterministic, low-latency, dual-channel acquisition in closed-loop industrial control systems where timing correlation and DC accuracy are non-negotiable.

FAQ

What is the maximum sampling rate supported by the AD4682BCPZ-RL7?

The AD4682BCPZ-RL7 supports a maximum throughput conversion rate of 1 MSPS, corresponding to a minimum inter-conversion interval (tCYC) of 1 µs. This rate is guaranteed across the full operating temperature range (−40°C to +125°C) with VCC = 3.0–3.6 V and no oversampling enabled. The device achieves this performance using dual SAR cores with simultaneous sampling architecture, and timing is synchronized to the falling edge of the CS signal.

Does the AD4682BCPZ-RL7 include an internal voltage reference?

Yes, the AD4682BCPZ-RL7 integrates a buffered 2.5 V internal reference with ±10 ppm/°C temperature coefficient and 7 µV rms noise. This reference is accessible via the REFIO pin and can be used as an output for external circuitry or disabled in favor of an external 2.5–3.3 V reference. When using the internal reference, a 1 µF capacitor must be placed between REFIO and GND, and the REFSEL bit in CONFIGURATION1 must be cleared to 0.

How does the oversampling feature improve performance in the AD4682BCPZ-RL7?

The AD4682BCPZ-RL7 implements on-chip rolling-average oversampling with OSR up to ×8, which improves SNR by up to 5.9 dB - from 87.5 dB to 93.4 dB - and enhances effective resolution to 18 bits when RES = 1. This is achieved through dedicated hardware blocks that average multiple conversions without host processor intervention, reducing noise floor and enabling high-fidelity capture of narrowband signals such as power harmonics or sensor outputs below 100 kHz.

What is the purpose of the SDOB/ALERT pin on the AD4682BCPZ-RL7?

The SDOB/ALERT pin on the AD4682BCPZ-RL7 is a multifunction terminal that operates either as Serial Data Output B (for ADC B conversion results) or as an open-drain Alert indication output. When configured as ALERT, it asserts low when a conversion result exceeds user-defined high/low thresholds stored in ALERT_HIGH_THRESHOLD and ALERT_LOW_THRESHOLD registers. Activation requires setting ALERT_EN = 1 in CONFIGURATION1 and SDO = 1 in CONFIGURATION2.

Can the AD4682BCPZ-RL7 operate with different logic supply voltages?

Yes, the AD4682BCPZ-RL7 supports VLOGIC from 1.65 V to 3.6 V, enabling interoperability with 1.8 V, 2.5 V, and 3.3 V digital interfaces. Input logic thresholds scale proportionally (VIL = 0.2 × VLOGIC, VIH = 0.8 × VLOGIC), and output drive strength adapts accordingly (VOH = VLOGIC − 0.3 V, VOL = 0.4 V). This flexibility allows direct connection to diverse microcontrollers and FPGAs without level-shifting circuitry, provided proper decoupling (1 µF capacitor) is applied to the VLOGIC pin.